package com.hnkywl.sts.action.portal;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.convention.annotation.ParentPackage;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Random;

/**
 * Created with IntelliJ IDEA.
 * User: jerry
 * Date: 13-3-14
 * Time: 下午2:38
 * To change this template use File | Settings | File Templates.
 */
@ParentPackage("default")
public class RandomPictureAction extends ActionSupport {
    /**
     *
     */
    private static final long serialVersionUID = -6950908478971552308L;

    private ByteArrayInputStream inputStream;

    public String execute() throws Exception {
        // 在内存中创建图象
        int width = 83, height = 29;

        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);

        // 获取图形上下文
        Graphics g = image.getGraphics();

        // 生成随机类
        Random random = new Random();

        // 设定背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);

        // 设定字体
        g.setFont(new Font("Times New Roman", Font.BOLD , 30));

        // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
        g.setColor(getRandColor(160, 200));
        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }

        // 取随机产生的认证码(4位数字)
        String sRand = "";
        for (int i = 0; i < 4; i++) {
            String rand = String.valueOf(random.nextInt(10));
            sRand += rand;
            // 将认证码显示到图象中
            g.setColor(new Color(20 + random.nextInt(50), 20 + random
                    .nextInt(50), 20 + random.nextInt(50)));
            // 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
            g.drawString(rand, 20 * i + 4, 25);
        }

        // 将认证码存入SESSION
        ActionContext.getContext().getSession().put("GYLWL_RAND_SESSION_KEY", sRand);

        // 图象生效
        g.dispose();
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);
        ImageIO.write(image, "JPEG", imageOut);
        imageOut.close();
        ByteArrayInputStream input = new ByteArrayInputStream(output
                .toByteArray());
        this.setInputStream(input);
        return SUCCESS;
    }

    /*
     * 给定范围获得随机颜色
     */
    private Color getRandColor(int fc, int bc) {
        Random random = new Random();
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }

    public void setInputStream(ByteArrayInputStream inputStream) {
        this.inputStream = inputStream;
    }

    public ByteArrayInputStream getInputStream() {
        return inputStream;
    }
}
